persider three cases.

Case $1$: A person holds her arm at an angle of $30$ above the horisontal $($hand is higher than shoulder$).$

Case $2$: A person holds her arm straight out parallel to the ground.

Case $3$: A person holds her arm at an angle of $30$ below the horisontal $($hand is lower than sheulder$).$

In which of the caves is the torque abost the showlder due to the weight of the arm the grestest?

Case $1$

Case $2$

Case $3$

Cases $1$ and $3$

same for all